U.S. patent application number 17/420243 was filed with the patent office on 2022-03-17 for cushioning rubber, reaction force adjusting method thereof, and pedestal.
This patent application is currently assigned to NOK CORPORATION. The applicant listed for this patent is NOK CORPORATION. Invention is credited to Masaya OTSUKA, Hiroyuki SHIMOOKA, Kodai TSUJINO.
Application Number | 20220082146 17/420243 |
Document ID | / |
Family ID | 1000006038877 |
Filed Date | 2022-03-17 |
United States Patent
Application |
20220082146 |
Kind Code |
A1 |
SHIMOOKA; Hiroyuki ; et
al. |
March 17, 2022 |
CUSHIONING RUBBER, REACTION FORCE ADJUSTING METHOD THEREOF, AND
PEDESTAL
Abstract
A sheet-shaped cushioning rubber including a planar base portion
and a three-dimensional portion formed to rise from the base
portion toward one side in a sheet thickness direction, the planar
base portion and the three-dimensional portion being alternately
provided in one direction of a sheet plane, wherein the
three-dimensional portion includes a hollow portion that opens
toward the other side in the sheet thickness direction. The
three-dimensional portion is integrally provided with a first
rising surface that is continuous from the base portion, a top
surface, a second rising surface on a side opposite to the first
rising surface, and a pair of rising surfaces on both sides in a
sheet width direction, and the hollow portion opens only toward the
other side in the sheet thickness direction.
Inventors: |
SHIMOOKA; Hiroyuki;
(Kumamoto, JP) ; OTSUKA; Masaya; (Kumamoto,
JP) ; TSUJINO; Kodai; (Kumamoto, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NOK CORPORATION |
Tokyo |
|
JP |
|
|
Assignee: |
NOK CORPORATION
Tokyo
JP
|
Family ID: |
1000006038877 |
Appl. No.: |
17/420243 |
Filed: |
January 30, 2020 |
PCT Filed: |
January 30, 2020 |
PCT NO: |
PCT/JP2020/003460 |
371 Date: |
July 1, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F16F 3/0876 20130101;
F16F 15/08 20130101; F16F 1/376 20130101; F16F 2226/04 20130101;
F16M 11/22 20130101; F16F 2230/36 20130101; F16F 2230/02 20130101;
F16F 1/371 20130101; F16F 1/377 20130101 |
International
Class: |
F16F 1/376 20060101
F16F001/376; F16F 1/377 20060101 F16F001/377; F16F 1/371 20060101
F16F001/371; F16F 3/087 20060101 F16F003/087; F16F 15/08 20060101
F16F015/08 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 15, 2019 |
JP |
2019-025397 |
Sep 11, 2019 |
JP |
2019-165310 |
Claims
1. A sheet-shaped cushioning rubber comprising: a planar base
portion and a three-dimensional portion formed to rise from the
base portion toward one side in a sheet thickness direction, the
planar base portion and the three-dimensional portion being
alternately provided in one direction of a sheet plane, wherein:
the three-dimensional portion includes a hollow portion that opens
toward another side in the sheet thickness direction, the
three-dimensional portion is integrally provided with a first
rising surface that is continuous from the base portion, a top
surface, and a second rising surface on a side opposite to the
first rising surface, and the hollow portion also opens toward both
sides in a sheet width direction.
2-3. (canceled)
4. The cushioning rubber according to claim 1, wherein a
reinforcing rib that is connected to the three-dimensional portion
and inhibits falling over of the three-dimensional portion is
integrally provided on a plane of the base portion.
5. The cushioning rubber according to claim 1, wherein a protrusion
used as a mounting margin for the cushioning rubber is integrally
provided to protrude in the width direction from an end portion of
the cushioning rubber in the width direction.
6. A method of adjusting a magnitude of a reaction force generated
in the cushioning rubber according to claim 13, the method
comprising: adjusting the magnitude of the reaction force generated
in the cushioning rubber by selecting, when the cushioning rubber
is manufactured, any of: forming each of the side rising surfaces
at a right angle with respect to the base portion and providing a
right-angled corner between each of the side rising surfaces and
the top surface; forming each of the side rising surfaces at a
right angle with respect to the base portion and providing a
rounded portion having an arc-shaped cross-section between each of
the side rising surfaces and the top surface; and forming each of
the side rising surfaces obliquely with a predetermined inclination
angle with respect to an imaginary plane perpendicular to the base
portion.
7. A cushioning rubber comprising: a flat plate portion; and a
plurality of protruding portions that protrude from the flat plate
portion, wherein: a periphery of each of the plurality of
protruding portions is surrounded by a portion of the flat plate
portion, and an inside of each of the plurality of protruding
portions is configured to be a cavity, an exhaust passage is
provided to allow air inside the cavity of each of the plurality of
protruding portions to be exhausted to an outside, and the exhaust
passage is configured of a plurality of grooves which are formed on
a surface of the flat plate portion on a side opposite to a side on
which the plurality of protruding portions protrude, so as to
extend from an inside of the cavity to a side surface of the flat
plate portion.
8. (canceled)
9. A pedestal comprising: a base plate; and at least one cushioning
rubber disposed in a state of being positioned on the base plate,
the cushioning rubber including a flat plate portion and a
plurality of protruding portions which protrude from the flat plate
portion, wherein a periphery of each of the plurality of protruding
portions is surrounded by a portion of the flat plate portion, an
inside of each of the plurality of protruding portions is
configured to be a cavity, and at least one of the base plate and
the cushioning rubber is provided with an exhaust passage which
allows air inside the cavity of each of the plurality of protruding
portions to be exhausted to an outside.
10. The pedestal according to claim 9, wherein the exhaust passage
is configured of a plurality of grooves which are formed on a
surface of the flat plate portion on a side opposite to a side on
which the plurality of protruding portions protrude, so as to
extend from an inside of the cavity to a side surface of the flat
plate portion.
11. The pedestal according to claim 10, wherein the exhaust passage
is configured of a groove formed in the base plate.
12. A sheet-shaped cushioning rubber comprising: a planar base
portion and a three-dimensional portion formed to rise from the
base portion toward one side in a sheet thickness direction, the
planar base portion and the three-dimensional portion being
alternately provided in one direction of a sheet plane, wherein:
the three-dimensional portion includes a hollow portion that opens
toward another side in the sheet thickness direction, and a
reinforcing rib that is connected to the three-dimensional portion
and inhibits falling over of the three-dimensional portion is
integrally provided on a plane of the base portion.
13. The cushioning rubber according to claim 12, wherein: the
three-dimensional portion is integrally provided with a first
rising surface that is continuous from the base portion, a top
surface, a second rising surface on a side opposite to the first
rising surface, and a pair of side rising surfaces on both sides in
a sheet width direction, and the hollow portion opens only toward
the other side in the sheet thickness direction.
14. A sheet-shaped cushioning rubber comprising: a planar base
portion and a three-dimensional portion formed to rise from the
base portion toward one side in a sheet thickness direction, the
planar base portion and the three-dimensional portion being
alternately provided in one direction of a sheet plane, wherein:
the three-dimensional portion includes a hollow portion that opens
toward another side in the sheet thickness direction, and
protrusion used as a mounting margin for the cushioning rubber is
integrally provided to protrude in the width direction from an end
portion of the cushioning rubber in the width direction.
15. The cushioning rubber according to claim 14, wherein: the
three-dimensional portion is integrally provided with a first
rising surface that is continuous from the base portion, a top
surface, a second rising surface on a side opposite to the first
rising surface, and a pair of side rising surfaces on both sides in
a sheet width direction, and the hollow portion opens only toward
the other side in the sheet thickness direction.
16. A method of adjusting a magnitude of a reaction force generated
in the cushioning rubber according to claim 15, the method
comprising: adjusting the magnitude of the reaction force generated
in the cushioning rubber by selecting, when the cushioning rubber
is manufactured, any of: forming each of the side rising surfaces
at a right angle with respect to the base portion and providing a
right-angled corner between each of the side rising surfaces and
the top surface; forming each of the side rising surfaces at a
right angle with respect to the base portion and providing a
rounded portion having an arc-shaped cross-section between each of
the side rising surfaces and the top surface; and forming each of
the side rising surfaces obliquely with a predetermined inclination
angle with respect to an imaginary plane perpendicular to the base
portion.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a cushioning rubber, a
method of adjusting a magnitude of a reaction force generated in
the cushioning rubber, and a pedestal including the cushioning
rubber.
BACKGROUND ART
[0002] FIG. 16 illustrates an item 52 loaded on a base 51. In such
a situation, a sheet-shaped cushioning rubber 53 may be laid on the
base 51, and then the loaded item 52 may be stacked thereon. The
cushioning rubber 53 has a function of heat transfer, heat
insulation, or the like, and as its name implies, exhibits a
function of a cushion. The cushioning rubber 53 between the loaded
item 52 and the base 51 prevents propagation of vibration from the
base 51 to the loaded item 52 or from the loaded item 52 to the
base 51.
CITATION LIST
Patent Literature
[PTL 1]
Japanese Patent Application Laid-Open No. 2010-192207
[PTL 2]
Japanese Patent Application Laid-Open No. 2018-73545
SUMMARY OF INVENTION
Technical Problem
[0003] The cushioning rubber 53 is formed of a flat rubber having a
predetermined thickness as illustrated.
[0004] When a cushioning rubber 53 is made of a flat rubber having
a predetermined thickness in this way, the following issues can be
pointed out.
[0005] Rubber is used as a cushion because it generates a reaction
force when it is compressed and behaves like a spring. The reaction
force tends to increase as an amount of compression increases. A
slope of a graph line corresponding to a correlation thereof
depends on rubber hardness.
[0006] In a case in which a compression margin is to be set larger,
the reaction force can be larger, and thus a component having
strength to withstand the reaction force is used as a counterpart
component receiving the reaction force.
[0007] If a component with poor strength such as a sheet metal is
used as the counterpart component, it is difficult to set a large
compression margin. Therefore, it is difficult to use a cushioning
rubber having a low reaction force characteristic in order for
receiving a large displacement of a counterpart component.
[0008] An object of the present disclosure is to provide a
cushioning rubber having a low reaction force characteristic in
which a large compression margin can be set.
Solution to Problem
[0009] A cushioning rubber of the present disclosure is a
sheet-shaped cushioning rubber comprising a planar base portion and
a three-dimensional portion formed to rise from the base portion
toward one side in a sheet thickness direction, the planar base
portion and the three-dimensional portion being alternately
provided in one direction of a sheet plane, wherein the
three-dimensional portion includes a hollow portion which opens
toward another side in the sheet thickness direction.
[0010] A reaction force adjusting method of a cushioning rubber of
the present disclosure is a method of adjusting a magnitude of a
reaction force generated in a cushioning rubber, the method
including adjusting the magnitude of the reaction force generated
in the cushioning rubber by selecting, when the cushioning rubber
is manufactured, any of: forming each of a pair of side rising
surfaces at a right angle with respect to the base portion and
providing a right-angled corner between each of the side rising
surfaces and a top surface; forming each of the side rising
surfaces at a right angle with respect to the base portion and
providing a rounded portion having an arc-shaped cross-section
between each of the side rising surfaces and the top surface; and
forming each of the side rising surfaces obliquely with a
predetermined inclination angle with respect to an imaginary plane
perpendicular surface to the base portion. The cushioning rubber is
a sheet-shaped cushioning rubber including a planar base portion
and a three-dimensional portion formed to rise from the base
portion toward one side in a sheet thickness direction, the planar
base portion and the three-dimensional portion being alternately
provided in one direction of a sheet plane, wherein the
three-dimensional portion includes a hollow portion which opens
toward another side in the sheet thickness direction. Further, in
the cushioning rubber, the three-dimensional portion is integrally
provided with a first rising surface continuous from the base
portion, a top surface, a second rising surface on a side opposite
to the first rising surface, and a pair of side rising surfaces on
both sides in a sheet width direction, and the hollow portion opens
only toward the other side in the sheet thickness direction.
[0011] Further, another cushioning rubber of the present disclosure
is a cushioning rubber including a flat plate portion and a
plurality of protruding portions that protrude from the flat plate
portion, wherein a periphery of each of the plurality of protruding
portions is surrounded by a portion of the flat plate portion, an
inside of each of the plurality of protruding portions is
configured to be a cavity, and an exhaust passage is provided to
allow air inside the cavity of each of the plurality of protruding
portions to be exhausted to an outside.
[0012] Further, a pedestal of the present disclosure is a pedestal
including a base plate and at least one cushioning rubber disposed
in a state of being positioned on the base plate, the cushioning
rubber including a flat plate portion and a plurality of protruding
portions which protrude from the flat plate portion, wherein a
periphery of each of the plurality of protruding portions is
surrounded by a portion of the flat plate portion, an inside of
each of the plurality of protruding portions is configured to be a
cavity, and at least one of the base plate and the cushioning
rubber is provided with an exhaust passage which allows air inside
the cavity of each of the plurality of protruding portions to be
exhausted to an outside.
[0013] According to these disclosures, when an item to be loaded is
loaded and thus the protruding portion is compressed, the air in
the cavity inside the protruding portion is exhausted through the
exhaust passage. Thus, an increase in an internal pressure in the
protruding portion is suppressed, and a repulsive force of the
protruding portion against the loaded item does not undergo a
change due to the internal pressure in the protruding portion. This
stabilizes the repulsive force of the protruding portion against
the loaded item.
[0014] The exhaust passage may be configured of a plurality of
grooves which are formed on a surface of the flat plate portion on
a side opposite to a side on which the plurality of protruding
portions protrude, so as to extend from an inside of the cavity to
a side surface of the flat plate portion.
[0015] This secures the exhaust passage even when an adhesive tape
is attached to the surface on the side opposite to the side on
which the plurality of protruding portions of the flat plate
portion of the cushioning rubber protrude in order to fix the
cushioning rubber to the base plate.
[0016] Further, the exhaust passage may be configured of a groove
formed in the base plate.
[0017] Further, the configurations described above can be combined
where doing so does not result in a contradiction.
Advantageous Effects of Invention
[0018] The cushioning rubber according to the present disclosure
can exhibit a low reaction force characteristic even when a large
crushing margin is set because the three-dimensional portion having
the hollow portion is provided alternately with the base portion.
Further, a magnitude of the reaction force generated in the
cushioning rubber can be adjusted by selecting and changing a shape
of the side rising surface.
BRIEF DESCRIPTION OF DRAWINGS
[0019] FIG. 1 is an overall perspective view of a cushioning rubber
according to a first embodiment.
[0020] FIG. 2A is a partially enlarged cross-sectional view of the
cushioning rubber, and FIG. 2B is a partially enlarged
cross-sectional view showing a state in which a load acts on the
cushioning rubber.
[0021] FIG. 3 is a diagram showing a cushioning rubber according to
a second embodiment, FIG. 3A is an overall perspective view of the
cushioning rubber as seen obliquely from above, and FIG. 3B is an
overall perspective view of the cushioning rubber as seen obliquely
from below.
[0022] FIG. 4A is a plan view of the cushioning rubber, and FIG. 4B
is a cross-sectional view of the cushioning rubber along line C-C
in FIG. 4A.
[0023] FIG. 5A is an enlarged cross-sectional view of the
cushioning rubber along line D-D in FIG. 4A, FIG. 5B is an enlarged
cross-sectional view of the cushioning rubber along line E-E in
FIG. 4A, and FIG. 5C is a partial cross-sectional view of the
cushioning rubber along line F-F in FIG. 5B.
[0024] FIGS. 6A and 6B are both explanatory diagrams showing a
deformed state of a three-dimensional portion.
[0025] FIGS. 7A and 7B are both plan views showing another example
of arrangement of reinforcing ribs.
[0026] FIG. 8 is a perspective view showing a first example of a
mounting structure for the cushioning rubber.
[0027] FIG. 9 is a diagram showing a frame body used in the
mounting structure, FIG. 9A is a plan view thereof, and FIG. 9B is
a cross-sectional view thereof along line G-G in FIG. 9A.
[0028] FIG. 10 is a perspective view showing a second example of
the mounting structure for the cushioning rubber.
[0029] FIG. 11 is a diagram showing a frame body used for the
mounting structure, FIG. 11A is a plan view thereof, FIG. 11B is a
cross-sectional view thereof along line H-H in FIG. 11A, and FIG.
11C is a cross-sectional view thereof along the line I-I in FIG.
11A.
[0030] FIG. 12 is a perspective view showing a third example of the
mounting structure for the cushioning rubber.
[0031] FIG. 13 is a diagram showing a frame body used in the
mounting structure, FIG. 13A is a plan view thereof, FIG. 13B is a
side view thereof, FIG. 13C is a partially enlarged side view of
the same of section J in FIG. 13B, and FIG. 13D is a partially
enlarged side view of the same of section K in FIG. 13B.
[0032] FIG. 14 is an explanatory diagram (cross-sectional view)
showing a reaction force adjusting method for the cushioning
rubber.
[0033] FIG. 15 is an explanatory diagram (a graph diagram) showing
a reaction force adjusting method in the cushioning rubber.
[0034] FIG. 16 is an explanatory diagram of the cushioning rubber
described in the background art.
[0035] FIG. 17 is an external view of a pedestal according to an
embodiment of the present disclosure.
[0036] FIG. 18 is an external view of a cushioning rubber according
to an embodiment of the present disclosure.
[0037] FIG. 19 is a schematic cross-sectional view of a cushioning
rubber according to an embodiment of the present disclosure.
[0038] FIG. 20 is an external view of a cushioning rubber according
to a modified embodiment of the present disclosure.
[0039] FIG. 21 is an external view of a base plate according to a
first modified embodiment of the present disclosure.
[0040] FIG. 22 is a diagram showing a base plate according to a
second modified embodiment of the present disclosure.
[0041] FIG. 23 is a diagram showing a base plate according to a
third modified embodiment of the present disclosure.
DESCRIPTION OF EMBODIMENTS
[0042] Modes for carrying out the present disclosure will be
illustratively described in detail below on the basis of
embodiments, examples, and the like with reference to the drawings.
However, dimensions, materials, shapes, relative arrangements, and
the like of components described in the present embodiment are not
intended to limit the scope of the present disclosure unless
otherwise specified. A pedestal including a cushioning rubber
according to the present embodiment described below can be suitably
used for loading an item such as a secondary battery to be loaded
on a vehicle body. However, an item to be loaded is not limited to
the secondary battery, and the pedestal according to the present
embodiment can be used for loading an item other than that is to be
loaded on the vehicle body. In particular, the pedestal according
to the present embodiment can be used in a place in which a shock
is generated due to vibration or the like.
First Embodiment
[0043] As shown in FIG. 1, a cushioning rubber 1 is formed as a
rubber molded product having a planar rectangular sheet shape as a
whole, and exhibits a cushioning action against an input load
acting in a sheet thickness direction (the z direction in FIG. 1).
The planar shape and the planar size of the illustrated cushioning
rubber 1 is an example thereof because these are determined based
on a shape and a size of an item to be loaded.
[0044] As shown in FIG. 2A, the cushioning rubber 1 has planar base
portions 2 and three-dimensional portions 3 formed to rise from end
portions of the base portions 2 toward one side (upward in the
figure) in the sheet thickness direction, which are alternately and
repeatedly provided in a sheet length direction that is one
direction on a sheet plane (a horizontal direction in the figure,
and x direction in FIG. 1).
[0045] The base portion 2 is formed in a flat plate shape.
[0046] The three-dimensional portion 3 is formed in a shape
integrally provided with one rising surface 31 (first rising
surface), which is continuous from the end portion of the base
portion 2, a top surface 32, and a rising surface 33 (second rising
surface) on a side opposite to the rising surface 31, and a hollow
portion 34 that opens toward the other side (downward in the
figure) in the sheet thickness direction is provided therein. The
pair of rising surfaces 31 and 33 including one rising surface 31
and the opposite rising surface 33 are formed in an inclined
surface shape (a taper shape) such that the pair of rising surfaces
31 and 33 come close to each other toward the one side (upward in
FIG. 2A) in the sheet thickness direction.
[0047] The base portion 2 and the three-dimensional portion 3 are
provided entirely in a sheet width direction (a direction
perpendicular to the paper plane in the figure, and y direction in
FIG. 1), that is, they are provided over the entire width.
[0048] Further, the base portion 2 and the three-dimensional
portion 3 are each provided to have a constant cross-sectional
shape entirely in the sheet width direction (over entire width).
Thus, the hollow portion 34 not only opens toward the other side in
the sheet thickness direction, but also opens toward both sides in
the sheet width direction.
[0049] When the cushioning rubber 1 is laid on a base 51 and an
item 52 to be loaded is loaded on the cushioning rubber 1, the
cushioning rubber 1 is compressed in the sheet thickness direction
as shown in FIG. 2B due to an input load F resulting from a weight,
vibration, or the like of the loaded item 52, and elastically
deforms to reduce its height.
Second Embodiment
[0050] As shown in FIGS. 3A and 3B, the cushioning rubber 1 is
formed as a rubber molded product having a planar rectangular sheet
shape as a whole, and exhibits a cushioning action against an input
load acting in the sheet thickness direction (z direction in FIG.
3A). The planar shape and the planar size of the illustrated
cushioning rubber 1 is an example thereof because these are
determined based on a shape and a size of an item to be loaded.
[0051] As shown in FIGS. 4 and 5, the cushioning rubber 1 has
planar base portions 2 and three-dimensional portions 3 formed to
rise from end portions of the base portions 2 toward one side
(leftward in FIG. 4B) in the sheet thickness direction, which are
alternately and repeatedly provided in a sheet length direction
that is one direction of a sheet plane (a vertical direction in
FIG. 4B and x direction in FIG. 3A).
[0052] The base portion 2 is formed in a flat plate shape.
[0053] The three-dimensional portion 3 is formed in a shape
integrally provided with one rising surface 31 (first rising
surface), which is continuous from the end portion of the base
portion 2, a top surface 32, a rising surface 33 (second rising
surface) on a side opposite to the rising surface 31, and side
rising surfaces (side walls) 35 on both sides in the sheet width
direction (y direction in FIG. 3A), and a hollow portion 34 that
opens toward the other side (rightward in FIG. 4B) in the sheet
thickness direction is provided therein. Thus, the hollow portion
34 does not open toward both sides in the sheet width direction,
but opens only toward the other side in the sheet thickness
direction because the hollow portion 34 is closed on both sides in
the sheet width direction by the side rising surfaces 35. The pair
of rising surfaces 31 and 33 including one rising surface 31 and
the opposite rising surface 33 are formed in an inclined surface
shape (a taper shape) such that the pair of rising surfaces 31 and
33 come close to each other toward one side (leftward in FIG. 4B)
in the sheet thickness direction.
[0054] As shown in FIG. 5B, the pair of side rising surfaces 35
provided on both sides in the sheet width direction are formed in
an inclined surface shape (taper shape) such that the pair of side
rising surfaces 35 come close to each other toward one side (upward
in FIG. 5B) in the sheet thickness direction. Thus, the
three-dimensional portion 3 has a trapezoidal shape when viewed in
a direction of FIG. 5B or 5A.
[0055] Reinforcing ribs 36 that are connected to the
three-dimensional portions 3 and inhibit falling over of the
three-dimensional portions 3 are integrally provided on the plane
of the base portion 2.
[0056] When a load such as a weight, vibration, or the like of the
loaded item 52 is input from above, the three-dimensional portion 3
is compressed in the sheet thickness direction as shown in FIG. 2B,
and only a middle portion thereof is to elastically deform to
expand toward both sides in the sheet length direction. On the
other hand, when the three-dimensional portion 3 is deformed to
fall over toward one side in the sheet length direction, or a root
portion of the three-dimensional portion 3 is deformed to spread
toward both sides in the sheet length direction, that is, as shown
in FIG. 6A, deformed such that a length of the root portion of the
three-dimensional portion 3 increases from L.sub.1 to L.sub.2,
desired reaction force may not be generated. In view of this, the
reinforcing ribs 36 are provided to support the three-dimensional
portion 3 from the sheet length direction, thereby inhibiting the
three-dimensional portion 3 from being deformed to fall over toward
one side in the sheet length direction or the root portion of the
three-dimensional portion 3 from being deformed to spread toward
both sides in the sheet length direction.
[0057] The reinforcing ribs 36 are disposed between a pair of
three-dimensional portions 3 adjacent to each other, extend in the
sheet length direction, and are connected to one three-dimensional
portion 3 at one ends thereof and to the other three-dimensional
portion 3 at the other ends.
[0058] The reinforcing ribs 36 are provided at end portions of the
base portion 2 in a width direction thereof. However, the positions
where they are provided are not limited and may be provided at a
central portion of the base portion 2 in the width direction. In
FIG. 7A, the reinforcing ribs 36 are provided at both ends of the
base portion 2 in the width direction, and additionally one
reinforcing rib 36 is further provided at the center in the width
direction. In FIG. 7B, the reinforcing ribs 36 are provided at both
ends of the base portion 2 in the width direction, and two
reinforcing ribs 36 are further provided at the central portion of
the base portion 2 in the width direction. In a case in which the
reinforcing ribs 36 are provided at the central portion of the base
portion 2 in the width direction, as shown in FIG. 6B, it is
possible to prevent the three-dimensional portion 3 from being
deformed to increase the length L.sub.2 of the root portion thereof
at the central portion of the base portion 2 in the width
direction.
[0059] In this example, the reinforcing ribs 36 are provided at
both end portions of the base portion 2 in the width direction,
that is, two reinforcing ribs 36 are provided. However, the number
of the reinforcing ribs provided is not limited. For example, in
FIG. 7A, three reinforcing ribs 36 are provided, one at each end
portion of the base portion 2 in the width direction, and one at
the center in the width direction. In FIG. 7B, four reinforcing
ribs 36 are provided, one at each end portion of the base portion 2
in the width direction, and two at the central portion of the base
portion 2 in the width direction.
[0060] Mounting margin protrusions 37 used as a mounting margin for
the cushioning rubber 1 are integrally provided at end portions of
the cushioning rubber 1 in the width direction as a whole from the
end portions of the cushioning rubber 1 in the width direction
toward a direction in which the width of the cushioning rubber 1
increases.
[0061] The mounting margin protrusions 37 are provided on both end
portions of the cushioning rubber 1 in the width direction.
[0062] The mounting margin protrusions 37 are used as engagement
parts for positioning the cushioning rubber 1 with respect to a
frame body and for preventing the cushioning rubber 1 from coming
off when it is mounted on the frame body. The mounting margin
protrusions 37 may be combined with the frame body in the following
manners.
First Example
[0063] In the example shown in FIGS. 8 and 9, the cushioning rubber
1 is inserted from one side of a frame body 41 in a longitudinal
direction thereof, and the mounting margin protrusions 37 are
inserted into mounting grooves 43 provided on an inner surface of
side walls 42 of the frame body 41, thereby the cushioning rubber 1
is positioned. The mounting grooves 43 are provided at both end
portions of the frame body 41 in a width direction thereof.
Further, the mounting grooves 43 are respectively provided to be
elongated in the longitudinal direction of the frame body 41.
Second Example
[0064] In the example shown in FIGS. 10 and 11, the cushioning
rubber 1 is press-fitted from above the frame body 41, and the
mounting margin protrusions 37 are press-fitted and engaged with
engagement protrusions 44 provided on the inner surfaces of the
side walls 42 of the frame body 41, thereby the cushioning rubber 1
is positioned. The engagement protrusions 44 are provided at both
end portions of the frame body 41 in the width direction. The
engagement protrusions 44 are separately provided from each other
at a plurality of positions (six positions in the figure) in the
longitudinal direction of the frame body 41.
Other Examples
[0065] In the example shown in FIGS. 12 and 13, the mounting margin
protrusions 37 are not used. Instead, the cushioning rubber 1 may
be press-fitted from one side of the frame body 41 in the width
direction, and a pair of reinforcing ribs 36 in the width direction
may sandwich an engagement protrusion 47 of an engagement portion
45 provided on a plane of the frame body 41 from both sides in the
width direction, thereby the cushioning rubber 1 is positioned. The
engagement portion 45 is provided on the plane and at a center of
the plane of the frame body 41 in the width direction. The
engagement portion 45 includes mounting grooves 46 that are
configured to accommodate the end portions of the base portion 2
when the cushioning rubber 1 is mounted, and the engagement
protrusions 47 that are configured to be sandwiched by the pair of
reinforcing ribs 36 and that are provided above the mounting
grooves 46.
[0066] The cushioning rubber 1 in first and second embodiments
having the configurations described above is not formed as a flat
and solid rubber as a whole, but is formed as a three-dimensional
rubber film body having a bellows shape or a wavy shape. Therefore,
when a load such as a weight or the like of a counterpart component
(the item 52 to be loaded) acts on this three-dimensional film
body, a reaction force is generated, but a magnitude of the
generated reaction force is much smaller than a reaction force
generated when a solid rubber is compressed. When a large load acts
and the rubber is further compressed, the film body becomes bent
further, and the reaction force is gradually increased. Thus, even
if a large compression margin is set, the reaction force does not
become extremely large, achieving a low reaction force
characteristic.
[0067] The cushioning rubber 1 having the above configuration is
suitable for filling gaps and coping with dimensional variation due
to heat when a component having poor strength such as a sheet metal
is used as the counterpart component.
[0068] In recent years, shifts to EV are remarkable in automobile
industries, and an EV housing including batteries and piping tends
to be larger in size, and on the other hand, it is difficult to
secure a strength of the EV housing while suppressing an increase
in weight. In view of this, the cushioning rubber 1 having the
above configuration that achieves a low reaction force
characteristic improves reliability and expands the possibility of
device design.
[0069] The pair of side rising surfaces 35 in the second
embodiment, which are provided as parts of the three-dimensional
portion 3, are configured not of vertical planes but of inclined
planes for the following reason.
[0070] If the side rising surface 35 is formed by a vertical plane,
large reaction force may be generated when a load such as a weight
of an item to be loaded acts on the cushioning rubber 1 from above.
On the other hand, if the side rising surface 35 is formed by an
inclined plane, the side rising surface 35 easily falls over toward
the hollow portion 34 side, and reduced reaction force is
generated.
[0071] Although the magnitude of the generated reaction force due
to the side rising surface 35 can be thus reduced by forming them
with an inclined plane, the reaction force does not become zero.
Therefore, further reduced reaction force is generated by the
cushioning rubber 1 according to the first embodiment in which the
side rising surface 35 is not provided than the cushioning rubber 1
according to the second embodiment in which the side rising surface
35 is provided.
[0072] The magnitude of the reaction force generated in the
cushioning rubber 1 can be adjusted by changing a three-dimensional
shape of the side rising surface 35. For example, by selecting the
shape of the side rising surface 35 from the following options, the
magnitude of the reaction force generated in the cushioning rubber
1 can be adjusted.
[0073] (First Option)
[0074] In the example shown in FIG. 14A, the side rising surfaces
35 are formed to rise at a right angle with respect to the base
portion 2, and right-angled corner portions 38 are provided between
the side rising surfaces 35 and the top surface 32 ("vertical wall
and right-angled corner type").
[0075] (Second Option)
[0076] In the example shown in FIG. 14B, the side rising surfaces
35 are formed to rise at a right angle with respect to the base
portion 2, and rounded portions 39 having arc-shaped cross-sections
are formed between the side rising surfaces 35 and the top surface
32 ("vertical wall and rounded corner type").
[0077] (Third Option)
[0078] In the example shown in FIG. 14C, the side rising surfaces
35 are formed obliquely with respect to an imaginary plane 2A
perpendicular to the base portion 2 to have a predetermined
inclination angle .theta..sub.1 ("small taper type").
[0079] (Fourth Option)
[0080] In the example shown in FIG. 14D, the side rising surfaces
35 are formed obliquely to have a predetermined inclination angle
.theta..sub.2 with respect to the imaginary plane 2A perpendicular
to the base portion 2, and a magnitude of the inclination angle
.theta..sub.2 is set to be larger than the inclination angle
.theta..sub.1 in the third option ("large taper type").
[0081] FIG. 15 shows magnitudes of the reaction forces generated in
the cushioning rubber 1 according to the first to fourth options,
where vertical plots "a" show magnitudes of the load for
compressing the cushioning rubber 1 by 3.5 mm in height, and
vertical plots "b" next to the plots "a" show magnitudes of the
load for compressing the cushioning rubber 1 by 7.0 mm in
height.
[0082] As shown in the graph of FIG. 15, by selecting and changing
the shape of the side rising surface 35, the magnitude of the
reaction force generated in the cushioning rubber 1 can be
adjusted.
[0083] If it is desired to reduce the load and achieve a low
reaction force only for a small compression amount (crushing
amount), the second option (vertical wall and rounded corner type)
is appropriate because the load is significantly lowered compared
to the first option (vertical wall and right-angled corner
type).
[0084] If it is desired to reduce the load and achieve a low
reaction force for throughout large and small compression amounts
(crushing amounts), the third option (small taper type) is
appropriate because the load is significantly lowered compared to
the first option (vertical wall and right-angled corner type) and
the second option (vertical wall and rounded corner type), and the
fourth option (large taper type) is more appropriate because the
load is even lower than that of the third option (small taper
type).
[0085] As a method of manufacturing the cushioning rubber 1, the
cushioning rubber 1 according to the second embodiment provided
with the side rising surfaces 35 can be molded with a rubber mold,
and the cushioning rubber 1 according to the first embodiment can
be manufactured by cutting out the side rising surfaces 35 of the
cushioning rubber 1 according to the second embodiment with a
knife, laser, water jet after demolding.
[0086] An item such as a secondary battery to be loaded on a
vehicle body or the like may be loaded on, for example, a pedestal
including a cushioning rubber in order to reduce an impact of
vibration from the vehicle body or the like. The cushioning rubber
functions to reduce the impact to the item by suppressing the
vibration. In each of the embodiments described above, a flat plate
portion (planar base portion) and a plurality of protruding
portions (three-dimensional portion) protruding from the flat plate
portion are provided, and the inside of each protruding portion is
configured to be a cavity. When an item to be loaded is loaded on
the cushioning rubber configured as above, the plurality of
protruding portions are compressed to generate an appropriate
repulsive force on the item, so that the above function can be
exhibited.
[0087] Note that the cavity inside the protruding portion of the
above configuration may be in a sealed state, and a pressure (an
internal pressure) of gas contained in the cavity may increase.
This may cause the repulsive force to vary from a desired magnitude
or uneven repulsive force to be generated by each of the protruding
portions.
[0088] In view of this, a cushioning rubber that can stabilize a
repulsive force when an item to be loaded is loaded, and a pedestal
including the cushioning rubber, will be described by the following
examples.
Examples
[0089] A cushioning rubber and a pedestal according to an
embodiment of the present disclosure will be described with
reference to FIGS. 17 to 19. FIG. 17 is an external view of the
pedestal. FIG. 17A is a plan view of the pedestal, FIG. 17B is a
side view of the pedestal (a view seen in the direction P in FIG.
17A), FIG. 17C is a part of a front view of the pedestal (a view
seen in the direction Q in FIG. 17A), and FIG. 17D is a part of the
front view of the pedestal in a state in which an item to be loaded
is loaded. FIG. 18 is an external view of the cushioning rubber.
FIG. 18A is a plan view of the cushioning rubber, FIG. 18B is a
front view of the cushioning rubber, FIG. 18C is a reverse side
view of the cushioning rubber, and FIG. 18D is a side view of the
cushioning rubber. FIG. 19 is a schematic cross-sectional view of
the cushioning rubber. FIG. 19A is a cross-sectional view along
line A-A in FIG. 18A, and FIG. 19B is a cross-sectional view along
line B-B in FIG. 18A.
[0090] <Pedestal>
[0091] An overall configuration of a pedestal 10 will be described.
The pedestal 10 includes a cushioning rubber 100 made of a rubber
material and a base plate 200 made of a material having rigidity
such as resin or metal. The cushioning rubber 100 is disposed in a
state in which it is positioned on the base plate 200. Three
cushioning rubbers 100 are provided on one base plate 200. However,
the number of cushioning rubbers provided on one base plate is not
limited, and at least one cushioning rubber may be provided on one
base plate.
[0092] The base plate 200 includes a bottom plate 210 having a
rectangular planar shape, a pair of longer-side wall 220 provided
along a pair of longer sides at both ends of the bottom plate 210
in a lateral direction thereof, and a shorter-side wall 230
provided along a shorter side at one end of the bottom plate 210 in
a longitudinal direction thereof. Further, hooks 221 and 231 are
provided at end portions of the longer-side walls 220 and the
shorter-side wall 230 on sides opposite to the bottom plate 210 to
extend along the longer-side walls 220 and the shorter-side wall
230.
[0093] By sliding the cushioning rubber 100 in the direction of
arrow P in FIG. 17A with respect to the base plate 200 configured
as described above, the cushioning rubber 100 can be disposed in
the state in which it is positioned with respect to the base plate
200. More specifically, the cushioning rubber 100 is slid in a
state in which vicinities of both lateral ends of a flat plate
portion 110 of the cushioning rubber 100 are sandwiched between the
bottom plate 210 and the pair of hooks 221 of the base plate 200,
so that the cushioning rubber 100 can be attached to the base plate
200. Further, minute gaps S are formed between side surfaces of the
flat plate portion 110 of the cushioning rubber 100 and inner wall
surfaces of the pair of longer-side walls 220 of the base plate 200
(see FIG. 17B).
[0094] <Cushioning Rubber>
[0095] The cushioning rubber 100 includes a flat plate portion 110
and a plurality of protruding portions 120 that protrude from the
flat plate portion 110. Each of peripheries of the plurality of
protruding portions 120 is surrounded by a part of the flat plate
portion 110 (see FIGS. 18A and 18C), and each of insides of the
plurality of protruding portions 120 is configured to be a cavity.
(See FIG. 19). When the cushioning rubber 100 configured as above
is placed on a planar surface, the cavities inside the protruding
portions 120 become sealed spaces. Thus, when the protruding
portions 120 are compressed by loading an item 500 to be loaded, a
pressure (an internal pressure) of gas in the sealed spaces may
increase. FIG. 17D shows a state in which the base plate 200 is
placed on a planar surface and the item 500 is loaded on the side
of the cushioning rubber 100 where the plurality of protruding
portions 120 are provided. Note that the pedestal 10 can be used
even in a reverse state. That is, the pedestal 10 can also be used
such that the plurality of protruding portions 120 of the
cushioning rubber 100 are placed on the planar surface and the item
500 is loaded on the base plate 200. Even in this case, the
cavities inside the protruding portions 120 become sealed spaces
due to the item 500, and thus, the pressure (internal pressure) of
the gas in the sealed spaces may increase when the protruding
portions 120 are compressed.
[0096] In the pedestal 10, at least one of the base plate 200 and
the cushioning rubber 100 is provided with an exhaust passage
through which air inside each cavity of the plurality of protruding
portions 120 can be exhausted to the outside. In the present
embodiment, the cushioning rubber 100 is mainly provided with the
exhaust passage.
[0097] In the cushioning rubber 100, a plurality of grooves 111
formed to extend from the cavity to the side surfaces of the flat
plate portion 110 are provided on a surface of the flat plate
portion 110 on a side opposite to a side on which the plurality of
protruding portions 120 protrude (FIGS. 18B and 18C, and FIG. 19).
The plurality of grooves 111 serve as exhaust passages. In the
illustrated example, the grooves 111 are provided on both end sides
of each of the protruding portions 120 in a longitudinal direction
thereof.
[0098] <Advantages of Cushioning Rubber and Pedestal>
[0099] According to the cushioning rubber 100 and the pedestal 10,
even when the protruding portions 120 are compressed by loading the
item 500 (see FIG. 17D), the air in the cavities inside the
protruding portions 120 are exhausted through the exhaust passages.
More specifically, the air in the cavities is exhausted to the side
surface sides of the flat plate portion 110 through the grooves
111, and further to the outside of the pedestal 10 through the gaps
S. Thus, an increase in the internal pressure in the protruding
portions 120 is suppressed, and repulsive forces of the protruding
portions 120 against the item 500 do not undergo a change due to
the pressure in the protruding portions 120. This stabilizes the
repulsive forces of the protruding portions 120 against the item
500. Thus, the pedestal 10 having the cushioning rubber 100 can
stably exhibit functions such as reducing an impact or the
like.
[0100] In addition, if an adhesive tape is attached to a surface of
the flat plate portion 110 of the cushioning rubber 100 on the side
opposite to the side on which the plurality of protruding portions
120 protrude in order to fix the cushioning rubber 100 to the base
plate 200, both ends of the grooves 111 (an end communicating with
the cavity and an end on side surface side of the flat plate
portion 110) are not closed. This enables the exhaust passages to
be secured.
[0101] (Others)
[0102] In the above embodiment, the grooves 111 are provided in the
flat plate portion 110 in order to provide the exhaust passages in
the cushioning rubber 100. However, the configuration for providing
the exhaust passages in the cushioning rubber 100 is not limited to
the above embodiment. For example, as shown by dotted lines in FIG.
17D, through holes 120a may be provided in the protruding portions
120. Through the through holes 120a, the gas in the cavities can be
exhausted directly to the outside of the pedestal 10 without
providing the gaps S shown in FIG. 17B. As shown in the figure, the
through holes 120a are to be provided at positions at which the
through holes are not closed by the item 500. Note that the
cushioning rubber 100 may have the grooves 111 only on the flat
plate portion 110, the through holes 120a only in the protruding
portions 120, or both the grooves 111 and the through holes
120a.
[0103] (Modified Example of Cushioning Rubber)
[0104] FIG. 20 shows a modified example of the cushioning rubber.
Here, a modification of the grooves provided in the flat plate
portion of the cushioning rubber shown in the above embodiment will
be described. FIG. 20 is an external view of a cushioning rubber
according to the modified example. FIG. 20A is a reverse side view
of the cushioning rubber, and FIG. 20B is a side view of the
cushioning rubber.
[0105] A cushioning rubber 100a according to the modified example
includes the flat plate portion 110 and the plurality of protruding
portions 120 that protrude from the flat plate portion 110,
similarly to the cushioning rubber 100 shown in the above
embodiment. The configurations of the flat plate portion 110 and
the protruding portions 120 are the same as those described in the
above embodiment, and thus descriptions thereof will be omitted.
The grooves provided on the surface of the flat plate portion 110
on the side opposite to the side on which the plurality of
protruding portions 120 protrude is different from those of the
above embodiment.
[0106] In the present modified example, the grooves provided in the
flat plate portion 110 includes a plurality of grooves 111 formed
to extend from the cavity to the side surfaces of the flat plate
portion 110, as in the above embodiment. In addition, a plurality
of grooves 112 for connecting the cavities of the protruding
portions 120 adjacent to each other, a plurality of grooves 113
formed to extend from the grooves 112 to the side surfaces of the
flat plate portion 110, and a plurality of grooves 114 formed to
extend from the cavity of the protruding portions 120 to side
surfaces of the flat plate portion 110 on both end sides in a
longitudinal direction thereof are provided.
[0107] The cushioning rubber 100a configured as described above
achieves the same effect as that of the above embodiment. In
addition, even if one of the grooves 111 of the cushioning rubber
100a is closed for some reason, the gas can be exhausted through
the cavity of the other protruding portions 120. This enables more
reliable gas exhaustion. Further, the grooves 114 secures the
exhaust passages if the gaps S shown in FIG. 17 are not
provided.
[0108] The through holes 120a shown in FIG. 17D may be provided in
the cushioning rubber 100a.
[0109] (First Modified Example of Base Plate)
[0110] A first modified example of the base plate will be described
with reference to FIG. 21. FIG. 21 is an external view of a base
plate according to the first modified example of the present
disclosure. FIG. 21A is a plan view of the base plate, and FIG. 21B
is a side view showing a state in which the cushioning rubber 100
shown in the above embodiment is disposed on the base plate.
[0111] A base plate 200a according to the first modified example
includes the bottom plate 210, the pair of longer-side walls 220
each provided with the hook 221, and the shorter-side wall 230
provided with the hook 231. Since these are the same as those of
the base plate 200 described in the above embodiment, descriptions
thereof will be omitted. In addition, in the base plate 200a, a
groove 211 is provided on a surface of the bottom plate 210. The
groove 211 of the base plate 200a functions as the exhaust passage
through which the air inside the cavities of the plurality of
protruding portions 120 can be exhausted to the outside.
[0112] The base plate 200a can secure the exhaust passage without
providing the grooves 111 or the through holes 120a in the
cushioning rubber 100. Note that the grooves 111 and the through
holes 120a may be provided in addition. Further, the cushioning
rubber 100a according to the above modified example may be attached
to the base plate 200a.
[0113] (Second Modified Example of Base Plate)
[0114] A second modified example of the base plate will be
described with reference to FIG. 22. FIG. 22 is a diagram showing a
base plate according to the second modified example of the present
disclosure. FIG. 22A is a plan view showing a state in which the
cushioning rubber 100 shown in the above embodiment is disposed on
the base plate, FIG. 22B is a plan view of the base plate, and FIG.
22C is a schematic cross-sectional view along C-C in FIG. 22B of
the base plate.
[0115] A base plate 200b according to the second modified example
includes the bottom plate 210 having a rectangular planar shape, a
pair of end hooks 240 provided at both ends of the bottom plate 210
in the longitudinal direction, and a pair of central hooks 250
provided at trisecting points of the bottom plate 210 in the
longitudinal direction. The cushioning rubber 100 can be attached
to the base plate 200b by sliding the cushioning rubber 100 from
the upper side to the lower side of the paper surface, or from the
lower side to the upper side in FIGS. 22A and 22B, which is a
different manner from the above described base plates 200 and 200a.
Both ends of the cushioning rubber 100 in the longitudinal
direction are sandwiched between the bottom plate 210 and either
the end hooks 240 or the central hooks 250, and thus the cushioning
rubber 100 is attached to the base plate 200b in a positioned
state. A dotted line in FIG. 22C shows a position of the flat plate
portion 110 when the cushioning rubber 100 is attached.
[0116] The base plate 200b can achieve the same effect as that of
the above embodiment. In addition, as shown in FIG. 22, the base
plate 200b may have the groove 211 provided on the surface of the
bottom plate 210 and notches 241 and 251 provided on the pair of
end hooks 240 and the pair of central hooks 250. This forms the
exhaust passage by the groove 211 and the notches 241 and 251.
Thus, as in the base plate 200a according to the first modified
example, the exhaust passage can be secured even if the cushioning
rubber 100 is not provided with the grooves 111 or the through
holes 120a. Note that the grooves 111 and the through holes 120a
may be provided in addition. Further, the cushioning rubber 100a
according to the above modified example may be attached to the base
plate 200b.
[0117] (Third Modified Example of Base Plate)
[0118] A third modified example of the base plate will be described
with reference to FIG. 23. FIG. 23 is a diagram showing a base
plate according to the third modified example of the present
disclosure. FIG. 23A is a plan view showing a state in which the
cushioning rubber 100 shown in the above embodiment is disposed on
the base plate, FIG. 23B is a top view of the base plate, FIG. 23C
is a schematic cross-sectional view of the base plate along D-D in
FIG. 23B, and FIG. 23D is a schematic cross-sectional view of the
base plate along E-E in FIG. 23B. Dotted lines in FIGS. 23C and 23D
show a position of the flat plate portion 110 in a state in which
the cushioning rubber 100 is disposed.
[0119] A base plate 200c according to the third modified example
includes the bottom plate 210 having a rectangular planar shape,
the pair of longer-side walls 220 provided along the pair of longer
sides at both ends of the bottom plate 210 in the lateral
direction, and the pair of shorter-side walls 230 respectively
provided along the shorter sides at both ends of the bottom plate
210 in the longitudinal direction. The base plate 200c has a
plurality of hooks 222 provided at intervals in end portions of the
longer-side walls 220 on a side opposite to the bottom plate 210,
which is a different configuration from the base plate 200
according to the above embodiment.
[0120] The cushioning rubber 100 can be attached to the base plate
200c by fitting the cushioning rubber 100 from the front side into
the back side of the paper surface in FIGS. 23A and 23B, which is a
different manner from the bases 200 and 200a. Both ends of the
cushioning rubber 100 in the lateral direction are sandwiched by
the plurality of hooks 222 and the bottom plate 210, and thus the
cushioning rubber 100 is attached to the base plate 200c in a
positioned state.
[0121] Further, the base plate 200c has grooves 211 and 232
provided on the surface of the bottom plate 210 and the inner wall
surfaces of the pair of shorter-side walls 230. An exhaust passage
is formed by the grooves 211 and 232. This secures the exhaust
passage even when the cushioning rubber 100 is not provide with the
grooves 111 or the through holes 120a, as in the base plate 200a
according to the first modified example. Note that the grooves 111
and the through holes 120a may be provided in addition. Further,
the cushioning rubber 100a according to the above modified example
may be attached to the base plate 200c.
REFERENCE SIGNS LIST
[0122] 1 Cushioning rubber [0123] 2 Base portion [0124] 3
Three-dimensional portion [0125] 31, 33 Rising surface [0126] 32
Top surface [0127] 34 Hollow portion [0128] 35 Side rising surface
[0129] 36 Reinforcing rib [0130] 37 Mounting margin protrusion
[0131] 38 Corner portion [0132] 39 Rounded portion [0133] 41 Frame
body [0134] 42 Side wall [0135] 43, 46 Mounting groove [0136] 44,
47 Engagement protrusion [0137] 45 Engagement portion [0138] 51
Base [0139] 52 Item to be loaded [0140] 10 Pedestal [0141] 100,100a
Cushioning rubber [0142] 110 Flat plate portion [0143] 111, 112,
113, 114 Groove [0144] 120 Protruding portion [0145] 120a Through
hole [0146] 200, 200a, 200b, 200c Base plate [0147] 210 Bottom
plate [0148] 211 Groove [0149] 220 Longer-side wall [0150] 221, 222
Hook [0151] 230 Shorter-side wall [0152] 231 Hook [0153] 232 Groove
[0154] 240 End hook [0155] 241 Notch [0156] 250 Central hook [0157]
251 Notch [0158] 500 Item to be loaded
* * * * *